There's only a few exercises you'll need to learn, all described very thoroughly in SS. A good gym will have people working there that will happily critique you

There's only a few exercises you'll need to learn, all described very thoroughly in SS. A good gym will have people working there that will happily critique your form for free. They want you to be safe! Avoid gyms without a squat rack (yes those exist, ugh). Things that matter: squat rack, affordability, and operating hours that work for you. Not being super-packed all the time is also really nice.